The Earth orbits in an ellipse.
地球沿椭圆形轨道运动。
地球围绕太阳运行。
地球绕着太阳运行。
地球绕太阳轨道运行。
In comparison, the Earth orbits at just 1 AU.
相比之下，地球轨道只是一个天文单位。
He concluded that the earth orbits the sun.
笛卡尔也总结出地球是绕着太阳转的。
Meteor showers occur when Earth orbits through clouds of particles and dust on its path around the sun.
流星雨是地球在绕太阳运行的轨道上穿过微粒和尘埃团时产生的。
The testing of outer space weapons in the low Earth orbits would aggravate the already acute problem of "space debris".
在近地轨道试验外空武器，将加剧业已严重的“空间碎片”问题。
A circle all around the sky. We can also imagine that while the Earth orbits around the sun, from down here on the surface.
从地球上看，我们将地球赤道往天际延伸之后我们称之为天体赤道，也就是现在被描述成天空四周的一个圆形区域。当地球沿着轨道绕太阳公。
The satellites will be strung along three medium-Earth orbits at 56 degrees inclination to the equator and will provide global coverage.
卫星将与三个中等地球轨道并排在与赤道56度的倾斜角度上运行，并且可以覆盖全球。
We can also imagine that while the Earth orbits around the sun, from down here on the surface, it can look like the sun orbits around us.
当地球沿着轨道绕太阳公转的时候，从平面这边的下端开始，以地球为参照物，这也能看成太阳沿着轨道绕我们运转。
It was a giant leap suddenly to argue that the Earth orbits the sun, rather than the other way around, particularly without telescopes.
要知道当时尤其是在没有望远镜的情况下，突然声称地球围绕太阳运动而非相反是多么巨大的飞跃。
Starbrook is a ground-based wide-field optical sensor capable of surveying the increasingly large number of objects in the higher-Earth orbits, such as the geostationary and GPS-type orbits.
Starbrook是一个地面宽场光学传感器，能够测量高空地球轨道内数量上不断增加的物体，比如地球同步卫星和全球定位系统型轨道。
The ultimate goal of Pakistan is to acquire the capability to design and build satellites for remote sensing and communications and to be able to launch light satellites in near-earth orbits.
巴基斯坦航天计划的最终目的是要获得设计和制造遥感卫星和通信卫星的能力，以及把轻型卫星送入近地轨道的能力。
Mars and Earth have orbits which change with time.
火星和地球的轨道随着时间而发生改变。
The orbits of Mercury, Venus, Earth, Mars, Jupiter and Saturn fit neatly into this pattern; Uranus, discovered in 1781, also obeyed the law.
水星、金星、地球、火星、木星和土星的轨道恰好符合这种模式；1781年发现的天王星也同样符合该定律。
They can attain more distant orbits; NASA plans for most of its future earth escaping payloads (to the moon and Mars especially) to carry CubeSats.
它们可以到达更远的轨道；美国国家航空航天局计划在其未来的大部分发射任务（尤其是去月球和火星的）中携带立方体卫星。
Mars orbits the Sun in 687 days, which means 1 Earth year on Mars is 687 days.
火星绕太阳公转的周期是687天，这意味着火星上的1个地球年是687天。
If the orbits of planets are not edge-on to observers on Earth, the technique underestimates the masses of the planets.
如果行星的轨道对于地球上的观测者来说并不是边缘向前的，这项技术会低估行星的质量。
They don't happen often-only about once a year-since the tilted orbits of the sun, moon, and Earth make their alignment rare.
它们并非经常发生，大约只有一年一次，因为太阳，月亮的轨道相互倾斜，它们很少能排成一条直线。
Due to the near-circular orbits of Earth and Jupiter, as Earth has a faster orbital period than Jupiter, from our point of view we will appear to "overtake" the gas giant.
由于地球和木星的公转轨道是椭圆的，同时地球的轨道周期快于木星，从我们的角度观察，就像“追上”了这颗巨型气态行星。
Those objects that once presented a threat of collision with the Earth or the Moon will have had their orbits altered by Moon-constructed spacecraft.
一旦发现某个星体构成与地球或月球碰撞的威胁，月球制造的宇宙火箭即使其改变轨道以解除威胁。
It will be able to replicate complex natural space environments and simulate low-Earth and geosynchronous orbits.
该系统将可以复制复杂的自然太空环境，并且模拟低地球同步轨道的环境。
HARPS can detect the slight gravitational wobble caused by planets as small as Earth, if they have incredibly close-in orbits.
HARPS能检测到到由像地球一样小的行星引起的轻微的引力摇摆，只要它们无限接近运行轨道。
Such asteroids would rapidly have adopted orbits that cut across those of the inner planets, including Earth.
这些小行星在横越其它内部行星后就会快速改变轨道，其中也包括地球。
The International Space Station orbits 354 kilometers (220 miles) above the Earth, completing one trip around the globe every 92 minutes.
国际空间站的轨道离地354公里(220英里)，每隔92分钟环绕地球一周。
If it did, planetary orbits would be disrupted, causing the Earth to drop into the sun or be tossed out into deep space.
如果它做到了，就会破坏行星轨道，导致地球落进太阳或被甩进外太空。
Since the eccentricities are small, we can assume that the orbits of the Earth around the Sun and the Moon around the Earth are both circles.
由于偏心率小，我们假定地球绕太阳的轨道和月球绕地球的轨道都是圆形。
Since the eccentricities are small, we can assume that the orbits of the Earth around the Sun and the Moon around the Earth are both circles.
由于偏心率小，我们假定地球绕太阳的轨道和月球绕地球的轨道都是圆形。
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